CN215067922U - Voltage output circuit of battery simulator and battery simulator - Google Patents
Voltage output circuit of battery simulator and battery simulator Download PDFInfo
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Abstract
The application relates to a voltage output circuit of a battery simulator and the battery simulator. The circuit includes: the power supply, the first direct-current voltage converter, the output voltage feedback circuit and the voltage output control circuit; the power supply is used for outputting power supply voltage; the first direct-current voltage converter is electrically connected to the output end of the power supply; the first direct current voltage converter receives a power supply voltage and outputs a first voltage; the first direct-current voltage converter is also used for receiving the feedback voltage and adjusting the magnitude of the first voltage according to the magnitude of the feedback voltage; the output voltage feedback circuit receives the first voltage and the analog control voltage and outputs a feedback voltage to the first direct current voltage converter; the output voltage feedback circuit compares the first voltage with the analog control voltage and adjusts the feedback voltage; the voltage output control circuit outputs the analog control voltage to the output voltage feedback circuit. The scheme that this application provided can realize adjusting the high accuracy of first voltage to reduce circuit consumption.
Description
Technical Field
The application relates to the technical field of battery simulators, in particular to a voltage output circuit of a battery simulator and the battery simulator.
Background
The battery simulator is used for replacing a power battery and specially developing experimental research and development for a plurality of modules of a motor single chip microcomputer, a driving motor, a whole vehicle test and the like in the new energy electric vehicle industry. The battery simulator can simulate the real output state and charge-discharge characteristics of the power battery, can change various conditions at any time according to the requirements of users, and can quickly verify the response of the equipment to be tested under different battery conditions. In the related art, the battery simulator deals with the test of different modules of the electric vehicle by setting different voltage output channels, and each channel generally adopts a circuit structure as shown in fig. 1 to regulate the output voltage.
As shown in fig. 1, the circuit includes a BAT power supply for simulating a power battery, which is assembled and connected by a circuit board, a DC-DC converter (Direct-Direct current converter) electrically connected to the BAT power supply to regulate an Output voltage of the BAT power supply, and an LDO (Low Drop Output, Low dropout linear regulator) electrically connected to the DC-DC converter to regulate the Output voltage converted by the DC-DC converter; the LDO is respectively electrically connected to a DAC (Digital to analog converter) and a CPU (central processing unit), the DAC is converted into an analog control voltage according to a Digital control signal of the CPU, so that the LDO can stabilize the converted output voltage of the DC-DC converter according to the analog control voltage, and high-precision control of the output voltage is realized.
However, when the current in the circuit is large, the power consumption of the LDO is high, which causes the LDO to generate heat seriously. When the circuits of the multiple channels work at a large current at the same time, the overall temperature of the circuit board can be increased, so that the service life of each electronic device on the board is affected, and the requirement on the performance of the power supply is higher due to the operation of the large current.
SUMMERY OF THE UTILITY MODEL
In order to solve or partially solve the problems in the related art, the application provides a voltage output circuit of a battery simulator and the battery simulator, which can realize high-precision regulation of the output voltage of the battery simulator and reduce the power consumption of the circuit.
A first aspect of the present application provides a voltage output circuit of a battery simulator, comprising:
the power supply, the first direct-current voltage converter, the output voltage feedback circuit and the voltage output control circuit; wherein:
the power supply is used for outputting a power supply voltage;
the first direct-current voltage converter is electrically connected to the output end of the power supply; the first direct-current voltage converter receives the power supply voltage and outputs a first voltage; the first direct-current voltage converter is also used for receiving a feedback voltage and adjusting the magnitude of the first voltage according to the magnitude of the feedback voltage;
the output voltage feedback circuit is electrically connected to the output end of the first direct current voltage converter and the input end of the first direct current voltage converter respectively; the output voltage feedback circuit receives the first voltage and the analog control voltage output by the voltage output control circuit and outputs the feedback voltage to the first direct current voltage converter; the output voltage feedback circuit compares the first voltage with the analog control voltage and adjusts the feedback voltage;
the voltage output control circuit is electrically connected to the input end of the output voltage feedback circuit; the voltage output control circuit outputs the analog control voltage to the output voltage feedback circuit.
In one embodiment, the output voltage feedback circuit includes an operational amplifier;
the input end of the operational amplifier is electrically connected to the output end of the first direct-current voltage converter and the output end of the voltage output control circuit respectively, and the output end of the operational amplifier is electrically connected to the input end of the first direct-current voltage converter;
the operational amplifier receives the first voltage and the analog control voltage and outputs the feedback voltage.
In one embodiment, the output voltage feedback circuit includes a voltage divider circuit;
the voltage division circuit is electrically connected with the output end of the first direct current voltage converter and the input end of the operational amplifier respectively; the voltage division circuit receives the first voltage and reduces the first voltage into a divided voltage; the voltage division circuit outputs the divided voltage to the operational amplifier.
In one embodiment, the voltage dividing circuit includes at least one voltage dividing resistor electrically connected to the output terminal of the first dc voltage converter and the input terminal of the operational amplifier, respectively.
In one embodiment, the voltage output control circuit includes a processor and a digital-to-analog converter connected to each other, and the processor outputs a digital control signal to the digital-to-analog converter, so that the digital-to-analog converter outputs the analog control voltage according to the digital control signal.
In one embodiment, the voltage output control circuit includes a second dc voltage converter electrically connected to the processor, and the second dc voltage converter is configured to receive an input voltage and convert the input voltage into a supply voltage with a preset voltage value to the processor.
In one embodiment, the second dc voltage converter is electrically connected to the power supply, and the input voltage received by the second dc voltage converter is the power supply voltage.
In one embodiment, the voltage output control circuit includes a single chip and an isolation chip, the isolation chip is electrically connected to the single chip and the processor, the single chip sends the digital control signal corresponding to the different first voltages, and the isolation chip receives the digital control signal sent by the single chip and transmits the digital control signal to the processor. In one embodiment, the isolation chip is connected to the processor through an SPI bus, and the processor is connected to the digital-to-analog converter through the SPI bus.
A second aspect of the present application provides a battery simulator comprising: the voltage output circuit as described above.
The technical scheme provided by the application can comprise the following beneficial effects:
the voltage output circuit of the battery simulator provided by the embodiment of the application converts the power supply voltage of the power supply into the first voltage through the first direct-current voltage converter. The output voltage feedback circuit generates a feedback voltage according to the first voltage and the analog control voltage output by the voltage output control circuit. The first direct-current voltage converter receives the feedback voltage and adjusts the magnitude of the first voltage according to the magnitude of the feedback voltage. In this way, by controlling the analog control voltage, finally, the regulation of the first voltage, i.e. the regulation of the output voltage of the battery simulator, can be achieved. The voltage output circuit can realize high-precision control of the first voltage without using a traditional low-dropout linear regulator, realizes simplified processing of the circuit, optimizes the circuit structure, is beneficial to reducing the power consumption of the circuit, and avoids serious heating of the circuit board.
Further, the voltage output control circuit provided in this application embodiment sends digital control signals corresponding to different first voltages to the processor through the single chip microcomputer, so that after the processor transmits the digital control signals to the digital-to-analog converter, the digital-to-analog converter outputs corresponding analog control voltages, and the analog control voltages are adjusted to adjust the magnitude of the feedback voltage, so as to accurately control the first voltages, and maintain the stability of the first voltages.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
Fig. 1 is a schematic structural diagram of a voltage output circuit of a battery simulator according to an embodiment of the present application;
fig. 2 is another schematic structural diagram of a voltage output circuit of a battery simulator according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the related art, when the current in the voltage output circuit of the battery simulator is large, the power consumption of the LDO is high, which causes the LDO to generate heat seriously. When the circuits of the multiple channels work at a large current at the same time, the overall temperature of the circuit board can be increased, so that the service life of each electronic device on the board is affected, and the requirement on the performance of the power supply is higher due to the operation of the large current.
In view of the above problems, embodiments of the present application provide a voltage output circuit of a battery simulator and a battery simulator, which can realize high-precision adjustment of an output voltage and reduce power consumption of the circuit.
The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a voltage output circuit of a battery simulator according to an embodiment of the present application.
Referring to fig. 1, the voltage output circuit of the battery simulator provided in the present embodiment includes a power supply 100, a first dc-to-dc voltage converter 200, an output voltage feedback circuit 300, and a voltage output control circuit 400.
The power supply 100 is used to output a supply voltage.
The first dc voltage converter 200 is electrically connected to an output terminal of the power supply 100. The first dc voltage converter 200 receives a power supply voltage and outputs a first voltage. The first dc voltage converter 200 is further configured to receive the feedback voltage, and adjust the magnitude of the first voltage according to the magnitude of the feedback voltage.
The output voltage feedback circuit 300 is electrically connected to the output terminal of the first dc voltage converter 200 and the input terminal of the first dc voltage converter 200, respectively. The output voltage feedback circuit 300 receives the first voltage and the analog control voltage, and outputs a feedback voltage to the first dc voltage converter 200. The output voltage feedback circuit 300 compares the first voltage with the analog control voltage to adjust the magnitude of the feedback voltage.
The voltage output control circuit 400 is electrically connected to the input terminal of the output voltage feedback circuit 300. The voltage output control circuit 400 outputs an analog control voltage to the output voltage feedback circuit 300.
The regulated first voltage is the output voltage finally output by the battery simulator. The voltage output circuit of the battery simulator provided in the embodiment of the present application converts the power supply voltage of the power supply 100 into the first voltage through the first dc voltage converter 200. The output voltage feedback circuit 300 adjusts the feedback voltage according to the first voltage and the analog control voltage output by the voltage output control circuit 400. The first dc voltage converter 200 receives the feedback voltage, and finally adjusts the magnitude of the first voltage according to the magnitude of the feedback voltage. By the design, the first voltage can be adjusted by controlling the analog control voltage. The voltage output circuit can realize high-precision control of the first voltage without using a traditional low-dropout linear regulator, realizes simplified processing of the circuit, optimizes the circuit structure, is beneficial to reducing the power consumption of the circuit, and avoids serious heating of the circuit board.
Further, in one embodiment, the power supply 100 of the battery simulator is used for simulating and outputting the power supply voltage of the power battery of the automobile. In the embodiment of the present application, the first dc voltage converter 200 is used to implement the functions of isolation and voltage reduction. It will be appreciated that when the battery is low, the supply voltage output by the battery will decrease. In this way, the voltage value of the power supply voltage received by the first dc voltage converter 200 decreases, and on the premise that no regulation is performed, the voltage value of the first voltage output by the first dc voltage converter 200 also decreases, that is, the first voltage that does not undergo regulation decreases, so that a stable first voltage cannot be output. In order to accurately output the stable first voltage, in the embodiment of the present application, the first dc voltage converter 200 adjusts the first voltage output by the first dc voltage converter 200 by receiving the adjusted feedback voltage. That is, the feedback voltage is adjusted to vary in magnitude. Specifically, the first direct current voltage converter 200 outputs the first voltage by subtracting the power supply voltage from the feedback voltage. When the power supply voltage is reduced, the feedback voltage is adjusted to be increased, so that the difference value between the power supply voltage and the feedback voltage is ensured to be unchanged, and the stable output of the first voltage is ensured. Therefore, the first voltage can be adjusted by adjusting the feedback voltage to increase the voltage value of the first voltage, so that the stability of the voltage value of the first voltage is guaranteed, and the high-precision control of the first voltage is realized.
To facilitate an understanding of the above principles, specific examples are given. For example, the power supply voltage of the power supply 100 is 12V, the first dc voltage converter 200 receives the 12V power supply voltage, and the first dc voltage converter 200 outputs the first voltage of 7V. When the power of the power supply 100 drops, the power supply voltage of the power supply 100 will be slightly lower than 12V, and the first voltage output by the first dc voltage converter 200 will also be slightly lower than 7V. At this time, in order to stabilize the first voltage at 7V, the first dc voltage converter 200 may receive the feedback voltage, and may reduce the voltage value of the feedback voltage to adjust the first voltage, so that the first voltage output by the first dc voltage converter 200 may be stabilized at 7V, and thus, the first voltage may be controlled with high accuracy.
It should be noted that, in the related art, the voltage output circuit of the battery simulator generally guarantees the stability of the voltage value of the first voltage through the low dropout regulator. However, since the first dc voltage converter 200 plays a role of voltage reduction in the circuit of the battery simulator, the current of the circuit connected to the output terminal of the first dc voltage converter 200 is large, that is, the input current of the low dropout regulator is large, so that the power consumption of the low dropout regulator is high, and the low dropout regulator generates heat seriously. In the embodiment of the present application, the voltage value of the first voltage of the first dc-to-dc converter 200 is directly controlled by the output voltage feedback circuit 300 and the voltage output control circuit 400, so as to ensure the stability of the voltage value of the first voltage, thereby eliminating the need of using the low dropout linear regulator, and achieving the purposes of optimizing the circuit structure, reducing the power consumption of the circuit, and avoiding the serious heat generation of the circuit board.
Referring to fig. 2, in the embodiment of the present application, the output voltage feedback circuit 300 includes an operational amplifier 310. The input terminal of the operational amplifier 310 is electrically connected to the output terminal of the first dc voltage converter 200 and the output terminal of the voltage output control circuit 400, respectively, and the output terminal of the operational amplifier 310 is electrically connected to the input terminal of the first dc voltage converter 200. The operational amplifier 310 receives the first voltage and the analog control voltage and outputs a feedback voltage.
Specifically, to adjust the feedback voltage to stabilize the first voltage, in one embodiment, the non-inverting input of the operational amplifier 310 receives the first voltage, the non-inverting input of the operational amplifier 310 is further grounded via a grounding resistor R1, and the inverting input of the operational amplifier 310 receives the analog control voltage. The output terminal of the operational amplifier 310 is connected to the input terminal of the first dc voltage converter 200 via a current limiting resistor R3 to output the feedback voltage to the input terminal of the first dc voltage converter 200, and the end of the current limiting resistor R3 away from the operational amplifier 310 is further connected to the ground via a ground resistor R4. The operational amplifier 310 may compare the unregulated first voltage with the analog control voltage to regulate the magnitude of the feedback voltage to form a regulated feedback voltage, so as to regulate the first voltage according to the feedback voltage, i.e., form a regulated first voltage, thereby ensuring stable output of the first voltage. It is understood that when the voltage value of the analog control voltage is greater than the voltage value of the first voltage, the voltage value of the feedback voltage will decrease, thereby achieving a decreasing adjustment of the voltage value of the feedback voltage.
However, the voltage value of the first voltage is generally larger, so as to facilitate reaching the condition that the voltage value of the analog control voltage is larger than the voltage value of the first voltage. In one embodiment, the output voltage feedback circuit 300 includes a voltage divider circuit 320. The voltage divider circuit 320 is electrically connected to the output terminal of the first dc voltage converter 200 and the input terminal of the operational amplifier 310, respectively. The voltage divider circuit 320 receives the first voltage and reduces the first voltage into a divided voltage. The voltage dividing circuit 320 outputs the divided voltage to the operational amplifier 310. In this way, the first voltage is stepped down by the voltage divider circuit 320, so that a divided voltage having a relatively small voltage value is output to the non-inverting input terminal of the operational amplifier 310. Then, the analog control voltage can be adjusted to reduce the voltage value of the feedback voltage as long as the analog control voltage is greater than the divided voltage. Therefore, the realization difficulty of adjusting the feedback voltage is reduced, and the voltage value of the feedback voltage is convenient to reduce.
Specifically, in the embodiment of the present application, the voltage dividing circuit 320 includes at least one voltage dividing resistor, and the at least one voltage dividing resistor is electrically connected to the output terminal of the first dc voltage converter 200 and the input terminal of the operational amplifier 310, respectively. In this way, the voltage divider circuit 320 may reduce the first voltage received by the voltage divider circuit to a divided voltage with a smaller voltage value through at least one voltage divider resistor. In one embodiment, the voltage divider circuit 320 includes a voltage divider resistor electrically connected to the output terminal of the first dc voltage converter 200 and the input terminal of the operational amplifier 310, respectively. Referring to fig. 2, for example, one end of the voltage dividing resistor R0 is connected to the output end of the first dc voltage converter 200, and the other end of the voltage dividing resistor R0 is connected to the non-inverting input end of the operational amplifier 310. The first voltage output by the first dc voltage converter 200 is processed by the voltage dividing resistor R0, converted into a divided voltage with a smaller voltage value, and output to the non-inverting input terminal of the operational amplifier 310.
In order to reduce the magnitude of the feedback voltage, in the embodiment of the present application, the voltage output control circuit 400 includes a processor 410 and a digital-to-analog converter 420 connected to each other, and the processor 410 outputs a digital control signal to the digital-to-analog converter 420, so that the digital-to-analog converter 420 outputs an analog control voltage according to the digital control signal. That is, the processor 410 outputs the digital control signal to the digital-to-analog converter 420, and the digital-to-analog converter 420 converts the digital control signal received by the digital-to-analog converter into an analog control signal, i.e., an analog control voltage, and outputs the analog control signal to the inverting input terminal of the operational amplifier 310. It can be understood that the feedback voltage is adjusted by comparing the first voltage with the analog control voltage based on the output voltage feedback circuit, and the adjustment of the feedback voltage will directly affect the stable output of the first voltage. Therefore, the input value of the digital control signal will directly affect the magnitude of the first voltage. I.e. a calibrated value of the digital control signal corresponds to a calibrated value of the first voltage. The magnitude of the first voltage is directly controlled by a digital control signal output from the processor 410.
In order to accurately control the analog control voltage, in an embodiment, the voltage output control circuit further includes a single chip 500 and an isolation chip 440, the isolation chip 440 is electrically connected to the single chip 500 and the processor 410, the single chip 500 sends digital control signals corresponding to different first voltages, and the isolation chip 440 receives the digital control signals sent by the single chip 500 and transmits the digital control signals to the processor 410. It is understood that the digital control signal output by the processor 410 is from the single chip microcomputer 500, and the processor 410 receives the digital control signal from the single chip microcomputer 500 and outputs the digital control signal to the digital-to-analog converter 420, so that the digital-to-analog converter 420 outputs a corresponding analog control signal according to the corresponding digital control signal. The operational amplifier 310 outputs different feedback voltages according to the received analog control signal. The first dc voltage converter 200 adjusts the first voltage to a corresponding magnitude according to receiving different feedback voltages. That is, the digital control signal and the first voltage form a corresponding relationship. A calibrated digital control signal corresponds to a calibrated first voltage. In this way, by presetting a data comparison table in the single chip microcomputer 500, the data comparison table marks a control value of a calibrated digital control signal corresponding to different first voltages, thereby realizing high-precision control of the first voltages.
In addition, the single chip microcomputer 500 is directly and electrically connected with the processor 410, and interference is easily caused by the single chip microcomputer. By providing the isolation chip 440, the isolation chip 440 is electrically connected to the processor 410, and the isolation chip 440 is configured to receive digital control signals corresponding to different first voltages and sent by the single chip microcomputer 500, and transmit the digital control signals to the processor 410. Thus, the isolation chip 440 plays a role in resisting interference, and ensures the correctness and reliability of the digital control signal received by the processor 410.
Furthermore, the reliability of digital control signal transmission is guaranteed. In one embodiment, the isolation chip 440 is connected to the single chip 500 and the processor 410 through an SPI bus, respectively, and the processor 410 is connected to the digital-to-analog converter 420 through the SPI bus. The SPI is a Serial Peripheral Interface (Serial Peripheral Interface) and is connected by using an SPI bus. In this way, the digital control signals received by the processor 410 are ensured to be reliable and effective, so as to ensure that the one-to-one corresponding adjustment relationship between the digital control signals with different calibration values and the first voltages with different calibration values can be realized.
Further, in order to ensure the stability of the circuit, in one embodiment, the voltage output control circuit 400 includes a second dc voltage converter 430, the second dc voltage converter 430 is electrically connected to the processor 410, and the second dc voltage converter 430 is configured to receive the input voltage and convert the input voltage into a supply voltage with a predetermined voltage value to the processor 410. For example, the second dc voltage converter 430 receives an input voltage of a power source, and converts the input voltage into a supply voltage with a voltage value of, for example, 5V to the processor 410, so as to ensure the stability of the power supply to the processor 410 and the stability and reliability of the operation of the processor 410.
It should be noted that the power supply 100 that supplies the input voltage to the second dc voltage converter 430 may be a battery, and further, may be the power supply 100 that outputs the power supply voltage to the first dc voltage converter 200. That is, the power supply 100 can output the power supply voltage to the first dc voltage converter 200 and the second dc voltage converter 430 at the same time, that is, the first dc voltage converter 200 and the second dc voltage converter 430 are connected to the same power supply 100 in parallel. In addition, the power supply for supplying the input voltage to the second dc voltage converter 430 may also be a different power supply, which is not limited in this application. Preferably, the second dc voltage converter 430 is electrically connected to the power supply 100, and the input voltage received by the second dc voltage converter 430 is a power supply voltage. That is, the first dc voltage converter 200 and the second dc voltage converter 430 are connected in parallel to the same power source 100.
The above embodiments describe the voltage output circuit of the battery simulator provided in the embodiments of the present application, and accordingly, the present application further provides an embodiment of the battery simulator, where the battery simulator provided in the present embodiment includes the voltage output circuit described in any of the above embodiments.
The battery simulator provided by the embodiment comprises a voltage output circuit. The voltage output circuit includes: a power supply 100, a first direct current voltage converter 200, an output voltage feedback circuit 300, and a voltage output control circuit 400. The power supply 100 is used to output a supply voltage. The first dc voltage converter 200 is electrically connected to an output terminal of the power supply 100. The first dc voltage converter 200 receives a power supply voltage and outputs a first voltage. The first dc voltage converter 200 is further configured to receive the feedback voltage, and adjust the magnitude of the first voltage according to the magnitude of the feedback voltage. The output voltage feedback circuit 300 is electrically connected to the output terminal of the first dc voltage converter 200 and the input terminal of the first dc voltage converter 200, respectively. The output voltage feedback circuit 300 receives the first voltage and the analog control voltage, and outputs a feedback voltage to the first dc voltage converter 200. The output voltage feedback circuit 300 compares the first voltage with the analog control voltage to adjust the magnitude of the feedback voltage. The voltage output control circuit 400 is electrically connected to the input terminal of the output voltage feedback circuit 300. The voltage output control circuit 400 outputs an analog control voltage to the output voltage feedback circuit 300. The battery simulator can realize high-precision control of the first voltage, simplify processing of a circuit, optimize the circuit structure, facilitate reduction of power consumption of the circuit and avoid serious heating of the circuit board.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A voltage output circuit of a battery simulator, comprising: the power supply, the first direct-current voltage converter, the output voltage feedback circuit and the voltage output control circuit; wherein: the power supply is used for outputting a power supply voltage;
the first direct-current voltage converter is electrically connected to the output end of the power supply; the first direct-current voltage converter receives the power supply voltage and outputs a first voltage; the first direct-current voltage converter is also used for receiving a feedback voltage and adjusting the magnitude of the first voltage according to the magnitude of the feedback voltage;
the output voltage feedback circuit is electrically connected to the output end of the first direct current voltage converter and the input end of the first direct current voltage converter respectively; the output voltage feedback circuit receives the first voltage and the analog control voltage output by the voltage output control circuit and outputs the feedback voltage to the first direct current voltage converter; the output voltage feedback circuit compares the first voltage with the analog control voltage and adjusts the feedback voltage;
the voltage output control circuit is electrically connected to the input end of the output voltage feedback circuit; the voltage output control circuit outputs the analog control voltage to the output voltage feedback circuit.
2. The voltage output circuit of claim 1, wherein the output voltage feedback circuit comprises an operational amplifier;
the input end of the operational amplifier is electrically connected to the output end of the first direct-current voltage converter and the output end of the voltage output control circuit respectively, and the output end of the operational amplifier is electrically connected to the input end of the first direct-current voltage converter;
the operational amplifier receives the first voltage and the analog control voltage and outputs the feedback voltage.
3. The voltage output circuit of claim 2, wherein the output voltage feedback circuit comprises a voltage divider circuit;
the voltage division circuit is electrically connected with the output end of the first direct current voltage converter and the input end of the operational amplifier respectively; the voltage division circuit receives the first voltage and reduces the first voltage into a divided voltage; the voltage division circuit outputs the divided voltage to the operational amplifier.
4. The voltage output circuit of claim 3, wherein:
the voltage division circuit comprises at least one voltage division resistor, and the at least one voltage division resistor is respectively and electrically connected with the output end of the first direct current voltage converter and the input end of the operational amplifier.
5. The voltage output circuit of claim 1, wherein:
the voltage output control circuit comprises a processor and a digital-to-analog converter which are connected with each other, wherein the processor outputs a digital control signal to the digital-to-analog converter, so that the digital-to-analog converter outputs the analog control voltage according to the digital control signal.
6. The voltage output circuit of claim 5, wherein:
the voltage output control circuit comprises a second direct current voltage converter which is electrically connected with the processor and is used for receiving input voltage and converting the input voltage into power supply voltage with a preset voltage value to the processor.
7. The voltage output circuit of claim 6,
the second dc voltage converter is electrically connected to the power supply, and the input voltage received by the second dc voltage converter is the power supply voltage.
8. The voltage output circuit of claim 5, wherein:
the voltage output control circuit comprises a single chip microcomputer and an isolation chip, the isolation chip is electrically connected with the single chip microcomputer and the processor respectively, the single chip microcomputer sends the digital control signals corresponding to different first voltages, and the isolation chip receives the digital control signals sent by the single chip microcomputer and transmits the digital control signals to the processor.
9. The voltage output circuit of claim 8, wherein the isolation chip is connected to the single-chip microcomputer and the processor through an SPI bus, respectively, and the processor is connected to the digital-to-analog converter through the SPI bus.
10. A battery simulator, characterized by: comprising a voltage output circuit according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121541102.6U CN215067922U (en) | 2021-07-06 | 2021-07-06 | Voltage output circuit of battery simulator and battery simulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121541102.6U CN215067922U (en) | 2021-07-06 | 2021-07-06 | Voltage output circuit of battery simulator and battery simulator |
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| CN215067922U true CN215067922U (en) | 2021-12-07 |
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2021
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